What are some best practices for handling error output for input fields in PHP?

When handling error output for input fields in PHP, it is important to validate user input and provide clear error messages to guide the user on how to correct their input. One best practice is to use conditional statements to check for errors and display error messages next to the input fields. Additionally, utilizing CSS to style the error messages can help make them more noticeable to the user. 

<?php
$error = "";

if ($_SERVER["REQUEST_METHOD"] == "POST") {
    $input = $_POST['input_field'];

    // Validate input
    if (empty($input)) {
        $error = "Please enter a value for the input field.";
    }
}

?>

<form method="post" action="<?php echo $_SERVER['PHP_SELF']; ?>">
    <input type="text" name="input_field">
    <span style="color: red;"><?php echo $error; ?></span>
    <input type="submit" value="Submit">
</form>

Keywords

validation error handling input fields PHP functions error messages

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